There's a Solar Sox vs. Rafters game on right now on MLB Network, if you want to get a look at how instant replay might look in the MLB next season. I missed it, but apparently they utilized it to make a call on a play at 1B already.

Once a recommendation on the new system for instant replay has been finalized, it will be subject to the approval of the Major League Clubs and the agreement of the Major League Baseball Players Association (MLBPA) and the World Umpires Association (WUA).